问题 解答题
295+37+63=630÷42=238+402=
15×28×2=18×35=25×32×125=
答案

(1)295+37+63,

=295+(37+63),

=295+100,

=395;

(2)630÷42,

=630÷(7×6),

=630÷7÷6,

=90÷6,

=15;

(3)238+402,

=238+400+2,

=638+2,

=640;

(4)15×28×2,

=(15×2)×28,

=30×28,

=840;

(5)18×35,

=9×2×35,

=9×(2×35),

=9×70,

=630;

(6)25×32×125,

=25×(4×8)×125,

=(25×4)×(8×125),

=100×1000,

=100000.

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